Circuit Recommended For The Uart Interface; Usb Interface - Huawei MU509 Series Hardware Manual

HUAWEI MU509 Series HSDPA LGA Module
Hardware Guide

3.5.2 Circuit Recommended for the UART Interface

Figure 3-16 shows the connection of the UART interface in the MU509 module (DCE)
with the host (DTE).
Figure 3-16 Connection of the UART interface in the MU509 module (DCE) with the host
(DTE)

3.6 USB Interface

The MU509 is compliant with USB 2.0 full speed protocol. Figure 3-17 shows the
circuit of the USB interface.
Table 3-10 Definition of the USB interface
Pin No.
86
85
Issue 09 (2014-03-06)
Module
(DCE)
UART_RX
UART_TX
UART_CTS
UART_RTS
UART_DTR
UART_DSR
UART_DCD
UART_RING
 For detailed application of the MU509 UART interface, see the
Serial Port Design Guide.
 It is recommended that set the pins related to UART interface as test points on the DTE
board for debugging.
 The maximum level of UART interface signals is 2.9 V. If these signals are connected to a
host with 3.3 V level, a level conversion circuit is required.
Make sure that the level of the UART signals are 0 V before MU509 module is powered on

to avoid the wind blow in which may cause the module cannot work properly.
The level of RS-232 Transceivers must match that of the MU509 module.

Pin Name
USB_DP
USB_DM
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
I/O Description
I/O USB data signal D+
I/O USB data signal D-
Application
(DTE)
TXD
RXD
RTS
CTS
DTR
DSR
DCD
RING
HUAWEI Module UART
DC Characteristics (V)
Min. Typ. Max.
- - -
- - -
40